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Whenever i get the error 'No valid host found' it means that the controller and compute node cannot communicate. When I run nova service-list on the controller, it would show status as down for nova-compute and nova-network. My causes were the Rabbit message service not connected or my networking was configured wrong (I usually have my ethernet ports backward eth0 = bridge, eth1 = public when it should be eth1 = bridge, eth0 = public in nova.conf) in my case anyway.